Controller UI

Make it easier to make UIs that can be used with controller.

Yes . I want s&box to work well with the steam machine and or steam deck (: 

Really need this for sGBA :D

Really need this for Dualsense! Pls correct CREATE vs. Touchpad (equals to SELECT) button! yes. CREATE (right tiny button) is not SELECT!

The Steam Controller is coming tomorrow. I guess it's already included to definitely support it as well.
If not, it would be very nice if it also gets special support for its own new functions that it will come with.

Steam Controller support is really poor. S&Box has no clue of how to handle 2d games vs 3d and mixed input like using the mouse+keyboard+gamepad at the same time. 
Steam Input is really the way to go! 

We used Steam Input for a while, it was a disaster

Steam Controller should have improved support now. Let me know if you run into any issues!